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Oscillations

# In figure a block of mass 100 kg tied to a string of linear mass density 0.1 Kg/m . Find the frequency of the wave on the string if the length of the string is 2 mts ?

$(a)\;50\;Hz\qquad(b)\;100\;Hz\qquad(c)\;200\;Hz\qquad(d)\;None\;of\;these$

Answer : (d) None of these
Explanation :
The frequency of vibration depends on the mode of vibration of the string . As the mode of vibration is not mentioned , hence data of the question is incomplete one .